Device for inking in the copper cylinder in intaglio printing



Dec. 24, 1940. K KUNGLER 2,226,311

DEVICE FOR INKING IN THE COPPER CYLINDER IN INTAGLIO PRINTING Filed March 12, 19:58

PatentedDec. 24, 1940 DEVICE FOR INKING IN THE COPPER. INDER IN INTAGLIO PRINTING Karl Klingler, Wurzburg, Germany Schnellpresseut assignor to abrik Kocnig & Bauer,

Aktiengesellschait, Wurrbnrg, Bavaria, Germany Application March 12. 1938, Serial No. 195,661 In Germany October 23 1936 11 Claims. (01. 1111-157X This invention refers to intaglio or'undersurface printing machines and particularly to a device for inking in a' copper intaglio printing cyl inder, from which, while it is rotating, the sur plus ink is stripped of! by a doctor which is axially moved to and fro.

With a general known device of this kind, the copper cylinder dips in an ink trough arranged underneath same opposite to the printing line. Another'method for inking in the copper cylinder is to transmit the ink to the copper cylinder by means of a long nozzle into which the ink is led by pressure.

The present invention is based on the idea to provide a method oi supplying and apparatus for supplying ink to the printing surface in such a' manner that the advantages resulting from inking in by liquid over-pressure are combined with the advantages of a copper cylinder bathing in an ink trough.

A further object of the invention is to provide means to avoid wear of the printing form in the case. where the ink is transmitted to the copper cylinder by liquid pressure.

A further object of the invention is to provide a mechanism to avoid, when using a copper cylinder that dips in an ink trough, that too much ink is led to the doctor which streaks to appear in the printing. 30 A further object o! the invention is to provide means which make it possible to use the inking in device for running the copper cylinder in both directions. 1 I

A further object of the invention is to provide 35 means, for preventing any access oi air to the ing on its way from the ink reservoir to the form cylinder.- i. e.; until after the ink has been applied to the i'ormcylinder, by which an evaporation oi the ink in the dipping trough and by 40 this adetrimental alteration in the composition of the ink is avoided. Besides this invention allows the quantity of the ink in the ink. trough to be small.

A further object or the invention consists in 46 the provision of an inking in device facilitating the use of copper cylinders of varying diameters. 1

Further objects. features and advantages will be more clearly understood in connection with 50 the accompanying drawing.

Fig. l is a schematic sectional elevation of the inking-in device if one doctor is arranged at each side of the copper cylinder.

Fig. 2 represents a side elevation of the ink- 65 ing-in device with only one doctor.

would cause Fig. 3 indicates a partialsection of Fig. 1, taken through the axis or thecylinder.

Fig. 4 shows the swing of the longitudinal wall of the ink housing which can be moved down or removed altogether. 5

Fig. 5 is a segmentalvview in section, taken through the swing axis'of Fig. 3.

Figs. 6 and 7 illustrate each. a cross section through the ink trough.

Underneath the copper cylinder I is arranged 10 an ink trough-2. The two longitudinal walls I and For the ink trough are distant from each other by 3" at least and are raised so in up to the circumference oi the copper cylinder that there is a corresponding gap '6 and i produced 15 between the copper cylinder and the longitudi- ,nal walls 4 and i of the ink trough, equal to the desired thickness of the ink film. v The height of this gap I and I may be adjusted by raising and lowering the ink trough I. For this pur- 20 pose the ink trough 2 is connected with a bolt 8 on each side. Each bolt 8 islodged in a stationary bearing 0 and may be adjusted inthe height by adjusting means, such as warm and worm gear, which may be minded from outside the press frames or by means-of a collar 8' held by a setscrew 8' as shown.

The two concave end walls 3 of the ink trough (Fig. 3) are not tightly touching the copper cylinder, but leave a very small gap between copper cylinder and end wall. These end walls 3 replace special ink strippers at the ends of the copper cylindenbecause they prevent splashing of the ink.

The ink-feed to the ink trough 2 is done by a piping Ill which runs into the bottom ii of the ink trough 2. Midway or the height of the trough is arranged an intermediary wall 36 (Fig. 6). This intermediary'wall has a series of holes 31, so that the ink is uniformly distributed all 40 over the length of the copper cylinder. The ink is fed under constant and adjustable pressure as by a pump It so that the ink trough 2 is under liquid pressure. The copper cylinderdips into the ink underliquid over-pressure. Thereby the .ink, by the rotating cylinder, is drawn into the gap which is formed by the copper cylinder and round bar i8 0! the longitudinal wall 01 the ink trough. The so produced return ink causes the ink to come into a close contact with the copper cylinder. v

-A certain part of the ink will overflow at the contractions I and I between copper cylinder Y and ink trough under the efiect of the overpressure. This ink flowing downwards, as well as the ink surplus stripped ofli by the doctors l2, l3 from the copper cylinder, is gathered in a special, housing |4 which encloses the ink trough 2 and the copper cylinder. The bottom 5 I5 of the housing i4 is provided -with an outlet piping l6, so that the surplus ink may return to the ink mixing box. This device is preferably so arranged that the ink piping I0 is located inside the ink outlet piping.

The new inking in device allows also the use of copper cylinders of very different diameters. When using a smaller copper cylinder than shown on the sketch, the height of the ink trough is adjusted accordingly.

The half-cylindrical bent upper ends of the two longitudinal walls 4, 5 of the ink trough 2 are provided with a protecting cap made of Bakelite or any other soft material (Fig. 6). It is also possible to form the two upper ends of the ink trough of a round bar I of Bakelite or pressed material made of artificial resin. In this manner a damage of the printing surface of the copper cylinder is made impossible even in the case of negligent minding of the device.

On the two ends of the ink trough 2 may be arranged stops or distance rolls l8 which, in the working position, touch the shaft of the cylinder i and so avoid that the necessary smallest distance of the ink trough from the copper cylinder is fallen short of. The adjustment in the height of the ink trough may be read on a scale which is connected with means (not shown in the drawing) for adjusting the trough 2 in its height.

With the device as in Fig. 1 two doctors I2,

i3 axially moved to and fro are provided of which one is always out of operation according to the turning direction of the copper cylinder. The

doctor i2 may be arranged either in the housing It or in the press frame IS. The doctor |3 can only be lodged in the side frames of the housing M, as usually there is no frame I9 at this point, as Fig. 2 shows.

One or both longitudinal walls 20, 2| of the ink trough housing ll are made shiftable so that the accessibility to the inside of it is facilitated and removal of the copper cylinder is made possible. For this purpose the longitudinal wall 2| is connected with the bottom of the housing M by hinges 24.

If the two longitudinal walls 20 and 2| of the housing are made exchangeable, it is suflicient to provide for one doctor only, even in the case of changing the turning direction of the copper cylinder. In this case an indentation in the shape of a bayonet lock 23 is provided (Figs. 4 and 5) in the boss 22 of the swing wall 2|. This serves for taking up a stop pin 25 lodged in the joint bolt 24. when the swinging wall 2| is to be raised, the joint bolt 24 is moved axially against the pressure of the spring 26 until it gives free the lodging 210i the housing M. Then the stop pin 25 is moved in the part 28 of the indentation so that it is fixed in its axial position. After this -the longitudinal wall 2| may be en- 5 tirely removed, without any dimculty.

If the machine is provided for only one turning direction, it is necessary to arrange for a room-saving, flat closing wall 29, on that side of the copper cylinder on which there is no doctor. As soon as, however, in connection with a supplement of the machine made later on, another doctor lodging is necessitated at this point, this housing wall 28 may be exchanged without any trouble against another 2| which contains a doctor lodging.

If desired, the housing wall may also be closed very tightly on the upper side whereby the doctor is located inside the housing. In order to be in a position to use also copper cylinders with varying diameters inspite of this, the two upper clos- 5 ing walls 30 and 3|, as well as the tightening bars 32 which are very near to the copper cylinder are arranged to swing upon the journals 33. The bolt journals 33 are supported by arms 34 which are arranged to swing upon stationary journals 10 35.

m this manner the lid may be tangentially pushed back when raised before it is moved upwards, without being hampered by the paper web 35. 15

The objects of the invention may be manifold and may vary and the above description and the drawing show only certain embodiments of the invention.

What I claim is: 20

1. In an intaglio machine, the combination of a printing cylinder with an ink trough arranged underneath the cylinder into which trough the cylinder dips, and a protecting member of material softer than that of the cylinder on the up- 25 per portions of the walls of the ink trough to prevent contact of. such wall portions with the cylinder.

2. A device as in claim 1, said member being made of artificial resin. 30 3. In an intaglio machine the combination of a printing cylinder with an ink trough arranged underneath the cylinder into which trough the cylinder dips, said trough being adjustable toward and from the cylinder, and means whereby 35 engagement of the upper margins of the trough .with the surface of the cylinder is positively prevented.

4. In an intaglio machine, the combination of a printing cylinder with an ink trough arranged 4 underneath the cylinder into which trough the cylinder dips, said trough being adjustable toward and from the cylinder, and means for preventing damage to the cylinder by contact of the upper margins of the trough with the surface 5 of the cylinder.

5. In an undersurface printing machine, the combination of an ink trough, a rotary printing cylinder above said trough and dippi into it, said trough extending over a substantial distance 50 circumferentially of said cylinder and having the upper portions of its longitudinal walls at an interval from said cylinder corresponding to the desired thickness of the film of ink to be applied to the cylinder and means to maintain the ink 55 in said trough under pressure against said cylinder.

6. Inan undersurface printing machine, the combination of an ink trough, a rotary printing cylinder above saidtrough and dippin into it, go said trough extending over a substantial distance circumferentially of said cylinder and having the upper portions of its longitudinal walls at an interval from said cylinder corresponding to the desired thickness of the film of ink to be applied '68 to the cylinder and said trough having a round spindle of compressed fiber forming the upper margin of each longitudinal wall of said trough.

7. In an undersurface printing machine, the combination of an ink trough, a rotary printing 70 cylinder above said trough and dipping into it, said trough ,extending over a substantial distance circumferentially of said cylinder and having the upper portions of its longitudinal walls at an interval from said cylinder corresponding to the 75 desired thickness 0f--the film of ink to be applied to the cylinder, a housing for said cylinder and trough, a side wall of said housing being pivotally mounted adjacent the bottom of the housing, a doctor on said wall, and means whereby said wall may be readily set up at either side of the housing, so that a single doctor serves for either direction of rotation of the cylinder.

8. In an undersurface printing machine, the combination of an ink trough, a rotary printing cylinder above said trough and dipping into it. said trough extending over a substantial distance circumferentially of said cylinder and having the upper portions of its longitudinal walls at an interval from said cylinder corresponding to the desired thickness of the film of ink to be applied to the cylinder. a housing for said cylinder and trough. a doctor on a side wall of the housing, and means for supporting said side wall pivotally adjacent the bottom of the housing. including retractible hinge pintles permitting ready removal of said wall from said housing.

9. An undersurface printing press comprising a rotary intaglio printing cylinder. means cooperating therewith for printing upon rotation of the cylinder in either direction including an ink trough having its sides so constructed and arranged as to control the thickness of the film of ink applied to said cylinder in either direction of its rotation. means for maintaining a body of ink in said trough under pressure against said cylinder. and means for adiusting said trough bodily toward and from said cylinder to vary the thickness of the film of ink applied to the cylinder.

10. An undersuriace printing press comprising an intaglio printing cylinder that prints directly on the paper by means of small ink-filled depressions in its periphery, an ink trough below said cylinder into which said cylinder dips, the distance between the upper walls of said trough and the periphery of said cylinder corresponding to the desired thickness of the film of ink to be applied to said cylinder, said walls being at least three inches apart so that the trough extends about and covers a substantial circumferential part oi said cylinder, means for causing'the ink in said trough to be held under pressure against said cylinder, and a constantly reciprocated doctor bearing against the surface of the cylinder to remove all ink except that in the depressions in its periphery.

11. An undersurface printing press comprising an intaglio printing cylinder that prints directly on the paper by means of small ink-filled depressions in its periphery, an ink trough below said cylinder into which said cylinder dips, the distance between the upper walls of said trough and the periphery of said cylinder corresponding to the desired thickness of the film of ink to be H applied to said cylinder, said walls being at least three inches apart so that the trough extends about and covers a substantial circumferential part 01' said cylinder, means for causing the ink in said trough to be held under pressure against said cylinder, and means for adjusting said trough toward and from said cylinder to vary the thickness of the film of ink applied to said cylinder.

KARL KLINGLER. 

